I didnt even try with 2 sticks only, I had 4 sticks from the beginning, and they worked perfectly for me.

But anyway, I didnt have such issues. I'm running on 2560NB and 2560HT. I did need to up the CPU NB voltage to 1,32V though. According to some guides up to 1,35V on the CPU NB was fine so I thought it was ok.

I didnt even try with 2 sticks only, I had 4 sticks from the beginning, and they worked perfectly for me.

But anyway, I didnt have such issues. I'm running on 2560NB and 2560HT. I did need to up the CPU NB voltage to 1,32V though. According to some guides up to 1,35V on the CPU NB was fine so I thought it was ok.

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Huh. good info, still. I am using Crosshair 5 Formula and 8150, so i thought we'd get similar results. 2 sticks clock great for me. Perhaps I'll spend some more time tweaking.

CH5 latest BIOS has memory profile for 4 GB sticks...that profile sets 1.4 V on NB. I was kinda shocked at that, but AMD chips aren't ones that I am afraid to shove volts into if needed. I am not using that profile, however. I did up to 1.35 V as well. I've not spent too much time with the 8150 yet, been kinda busy with other hardwares.

Okay, well, I can post some pictures of AMD overdrive showing all the sub timing when I come home in 1 hour, might help you both clock your ram with bulldozer.
I've spent considerable time getting them to run above 2100MHz aswell, but no matter what timing or subtimings I used, they wouldn't be stable in prime95(would boot in windows fine). Even upping the voltage to 1,65V wouldn't help. The only thing I didn't try was setting it to T2. After that I gave up and set most of the subtimings to auto again and settled for my current speed/timings.

BIG EDIT:
ok, got some screenies from settings I use:
AMD Overdrive memory timings and configuration. This seems to correctly display *most* of the timings.

Okay, well, I can post some pictures of AMD overdrive showing all the sub timing when I come home in 1 hour, might help you both clock your ram with bulldozer.
I've spent considerable time getting them to run above 2100MHz aswell, but no matter what timing or subtimings I used, they wouldn't be stable in prime95(would boot in windows fine). Even upping the voltage to 1,65V wouldn't help. The only thing I didn't try was setting it to T2. After that I gave up and set most of the subtimings to auto again and settled for my current speed/timings.

Would you recommend usong AMD overdrice over the BIOS to someone who doesn't fully get/have the patience for BIOS overclocking?

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That depends, for an instance, as you can see you cannot change the Cas Latency in overdrive. This is one of the most important timings of your RAM, so thats something you would still have to do in bios. Furthermore, you cannot change the Ram:FSB ratio in overdrive, meaning you are limited to FSB overclocking your RAM only with overdrive.
However, I can imagine AMD Overdrive actually giving you more RAM tweaking options when it comes to subtimings if you do not have a very expensive and/or overclocking friendly board.

Also, I noticed that if I changed any voltage in my bios from auto to a specific manual voltage, it would not display this voltage correctly in Overdrive(This could be a motherboard specific problem though)

I would certainly recommend using AMD overdrive for finetuning your RAM frequency however.

Also, AMD overdrive is great for tuning your processor, especially if you got a multiplier unlocked processor. In combination with a good stress test which reports errors before you actually bluescreen, you can really finetune your frecuency/voltage without the hassle of rebooting all the time.

Have two more sticks here to try out as well and thus can also test 16GB (and also a buddy's Sandy build to try them in).

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Hi Wrigleyvillain

Did you ever get a chance to try this out? I am tempted to go to 16gb while RAM is cheap - at this price for this performance I can always use the ram in another system in future or something.

Also, in general, I noticed BF3 yesterday felt smoother/more responsive on the new mem. This was updated gfx drivers too though so that might be a factor. Not sure if this was because of 1T timings or 1600>2133 mhz or both. Nice though!

Did you ever get a chance to try this out? I am tempted to go to 16gb while RAM is cheap - at this price for this performance I can always use the ram in another system in future or something.

Also, in general, I noticed BF3 yesterday felt smoother/more responsive on the new mem. This was updated gfx drivers too though so that might be a factor. Not sure if this was because of 1T timings or 1600>2133 mhz or both. Nice though!

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No not as yet will tonight. I have to send the other two sticks to El Mayo in the UK soon anyway.

wow. these are silicon GOLD!
i was semi-impressed on my p55 boards... but now, on this x79, just wow.
i'll post screenshots later as i'm at work now, but they're running stable at 2235MHz, 11-11-11-28-143 1t at 1.395v measured with a DMM under full load(1.4000 in BIOS).
can't wait to get home and push them further
suffice it to say, if anyone sees date code 1149, BUY THEM.